From: Justin Piszcz <jpiszcz@lucidpixels.com>
Subject: dump/restore not supported for ext4
Date: Thu, 4 Mar 2010 17:05:56 -0500 (EST)
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Hi,

I should have researched it more:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511651
https://lists.ubuntu.com/archives/universe-bugs/2009-June/098729.html

Looks like it's broken, I agree with the reporters, dump should abort if 
it is dealing with an ext4 filesystem, since you cannot restore data from 
an ext4 dump.

Justin.